Initial commit

engines/darkseed/kidpic.cpp

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "common/debug.h"
+#include "common/file.h"
+#include "darkseed/darkseed.h"
+#include "darkseed/kidpic.h"
+
+namespace Darkseed {
+
+static constexpr int BYTES_PER_LINE = 320;
+static constexpr int BYTES_PER_PLANE = 80;
+
+static constexpr int KID_WIDTH = 640;
+static constexpr int KID_HEIGHT = 350;
+
+KidPic::KidPic() {
+	_pixels.resize(KID_WIDTH * KID_HEIGHT);
+	Common::File file;
+	if (!file.open("kid.pic")) {
+		error("Failed to open kid.pic");
+	}
+
+	file.seek(0x10);
+	Pal pal;
+	pal.loadFromStream(file, false);
+	pal.swapEntries(14, 4); // not sure why we need to swap these palette entries. All the other entries line up correctly.
+	pal.installPalette();
+	unpackRLE(file);
+}
+
+bool KidPic::unpackRLE(Common::SeekableReadStream &readStream) {
+	uint idx = 0;
+	uint unpackedSize = _pixels.size() / 2;
+
+	readStream.seek(0x80);
+
+	while (idx < unpackedSize && !readStream.eos()) {
+		uint8 byte = readStream.readByte();
+		assert(!readStream.err());
+
+		uint repeat = 1;
+		if ((byte & 192) == 192) {
+			repeat = (byte & 63);
+			byte = readStream.readByte();
+			assert(!readStream.err());
+		}
+
+		for (uint j = 0; j < repeat; j++) {
+			unpackByte(byte);
+		}
+		idx += repeat;
+	}
+
+	return true;
+}
+
+// image is stored as 4 x 1-bit planes per line.
+void KidPic::unpackByte(uint8 byte) {
+	int planeOffset = _lineByteIdx / BYTES_PER_PLANE;
+	int x = _lineByteIdx % BYTES_PER_PLANE;
+	for (int i = 0; i < 8; i++) {
+		if (byte & 1 << (7 - i)) {
+			_pixels[_lineNum * KID_WIDTH + (x * 8) + i] |= 1 << planeOffset;
+		}
+	}
+	_lineByteIdx++;
+	if (_lineByteIdx == BYTES_PER_LINE) {
+		_lineByteIdx = 0;
+		_lineNum++;
+	}
+}
+
+void KidPic::draw() {
+	g_engine->_screen->copyRectToSurface(_pixels.data(), KID_WIDTH, 0, 0, KID_WIDTH, KID_HEIGHT);
+}
+
+} // namespace Darkseed